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J. C. GITHENS.

ROCK DRILL.

No. 356,464. Patented Jan. 25, 1887.

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SPECIPICATION forming part of Letters Patent No. 356,464, dated January25, 1887.

Application filed September 17, 1886. Serial No. 213,775. (No model.)

To all whom it may concern:

Be it known that I, J OSEPH O. GITHENS, of North Tarrytown, New York,have invented certain Improvements in Rock-Drills, of which piston-rodcan be easily obtained for the purpose of renewing them when wornwithout removing the piston from the cylinder or otherwise deranging theparts of the drill, it being only necessary to loosen the bolts holdingthe cylinderhead and to draw it away from the cylinder.

My improvement consists in making what is usually called the frontcylinder-head in the form of a sleeve which is longitudinally slit onone side, and which has an internal diameter sufiiciently great topermit the piston to pass freely through it, and which is provided withclamping devices by means of which it is securely clamped upon aremovable parting bushing, through which the piston-rod passes.

The accompanying drawings, illustrating my improvement, are as follows:

Figural is an elevation of a rock-drill cylinder provided with myimproved cylinder head. Fig. 2 is a sectional view of the frontcylinderhead and a portion of the cylinder, showing the piston andpiston rod in elevation. Figs. 3 and 4 are end and side elevations,respectively, illustrating the construction'of the parting bushing.Figs. 5 and 6 are end and side elevations, respectively, of the slitsleeve; and Figs, 7 and 8are end and side elevations, respectively, ofthe divided pack-- ing-gland.

As shown in the drawings, the front cylinder-head is composed of acylindrical sleeve,

A, which is slit open longitudinally at one side, and is provided withfour perforated lugs, A A, two on either side of the slit a, throughwhich lugs are inserted the screw-bolts BB, which draw the edges of theslit sleeve A together and bind it firmly upon the parting bushing O,which is inserted within the sleeve A.

The sleeve A is longer than that part of the bushing O which itincloses, and the portion which extends beyond the end of the bushing isprovided with an internal screw-thread for engaging the screw-threadsformed upon the exterior of the split packing-gland D, between which andthe end of the bushing O isinserted packing material E. WVhen the boltsB B are tightened, the split gland D is clamped within the sleeve A, andis prevented from being loosened by the vibration of the machine in use.

One end of the bushing O is turned to fit the interior of thesteaincylinder F, and the other end to fit the interior of the sleeve A,and is provided with a flange, 0, near its cylinder end. Oneside oftheflange bears against the end of the cylinder F, while the other bearsupon the end of the sleeve A, and the flange is thus clamped between theends of the cylinder F and the sleeve A, when the bolts G G, which passthrough perforated lugs g g on the sleeve A, are tightened. ,The bolts GG pass through similar lugs formed on the rear cylinder-head, which isof the usual construction, and serve to secure both the front and rearheads to the cylinder.

In erecting the machine the piston H is passed through the sleeve A andinserted in the cylinder F. The halves ofthe parting bushing 0 are thenplaced together, encircling the piston-rod H, and the sleeve A slippedover their ends. The other end of the bushing G is then inserted in theend of the cylinder F, and the bolts G G put in place and screwed up.Then the packing material E is inserted in the annular space between theend of the sleeve A and pistonrod H, and the split gland D placed uponthe piston-rod and screwed in upon the packing E. The bolts 13 B arethen tightened and the cylinder-head is in place.

To renew the bushing C it is only necessary to loosen the bolts G G andB B and draw the sleeve A away from the cylinder F, when the halves ofthe bushing 0 may be easily drawn out and. replaced by new ones.

The sleeve A'is'preferably made of malleable'iron, and the partingbushing O and packing-gland D of cast-iron or other suitablemanally-slit sleeve A, the parting bushing C, the terial. The outer endof the gland D is prodivided packing-gland l), and the bolts B B, IOvided with lugs (Z d to engage the notches of a for clamping the sleeveupon the said bushing spanner-wrench. and gland. i 5 I claim as myinvention- JOSEPH C. GITHENS. In a rock-drill, the combination, suhstan-Witnesses:

tially as herein set forth, With a steameylin- V. S. BARNUM,

(1e1 piston, and piston-rod, of the iongitudi- H. V. CONRAD.

